I currently have the new Quad wide band on my 2009 F-150, I would like to try something during my trip to WV with a trailer hooked up.

right now the EFIE it set a 9 0' clock on the front O2 (wide band) and 200mv on the post cat narrow band.

At what setting should I set both if all I want to do is keep the ECU from scheduling anymore fuel than what's already program to meet the 14.7:1

I guess you can say I want to take advantage of the extra power obtained from the HHO being used as a catalyst assisting in burning majority of the fuel vice being pushed out to the cat to take care of.

I have the Infinity at 400mv for the front O2 and 2oomv for the rear, of course these are narrow band.

If you just want more power from the HHO, turn off EFIE entirely. If you want a little more power but not at the cost of mileage, then use the EFIE sparingly, like you have on the Infinity.

I can't tell you exact numbers. It's trial and error in all cases. The computer programming, model to model, is too different. Further, I have no experience or feedback from wide band EFIEs on Fords yet. 2009 was the first year we saw them, and in 2009, I believe only the flex fuel versions had wide bands (but my memory may be failing me on that point).